Im running 275's on the front with a 15mm spacer. Here's a pic of how it looked before I got my new wheels. Trust me, 275 in the front will work fine with the stock Rays, stock offset AND 15mm spacers. Ran it like that for about two months until I changed my wheels.

Actually i just posted a pic of guy who accidently had his 275 on the front. It was at a meet today I was wtf dude look at your tire.. he said he knows. I asked if he had any rubbing and he said no lol so i dont think theres a problem..

thanks, with the 275/35/19 and 15 mm spacer in front with a 3/4" wheel gap, that should be alright right? no rubbing. Planning to go low, but not extreme. Jsut trying to even out the look of the 305/30's in the rear without spending more money to change the tires in the front. Just switching the stock rear tires to the front.